Note that this is due to legal requirements around discovering a user's age in a "neutral" way, in order to block under-13 users (or varying other ages depending on global jurisdiction). This is called a "neutral age screen". The screen cannot indicate that there will be a lockout, or underage users would just say they were older to get around it. It sucks, but most apps of a certain size and liability profile have t…
I don't know, I felt really stupid when I entered the wrong year but since then I've grown increasingly frustrated by how poorly this feature has been implemented.